Current research projects

Image In-situ investigation concerning the swelling behaviour of polymer materials under elevated pressures and temperatures
Image Investigation according to DIN EN ISO 14903
Image Performance tests of condensing units
Image CFE-Test of Cooker Hoods
Image Lifetime prediction of hermetic compressor systems
Image Reduction of primary noise sources of fans
Image Refrigerants, lubricants and mixtures
Image Certifiable connection types in cryogenics
Image Laseroptical measurement
Image Combined building and system simulation
Image Investigation of coolants
Image Micro heat exchangers in refrigeration
Image Overall System Optimization of Refrigeration Plant Systems for Energy Transition and Climate Protection
Image Air-flow test rig for fan characteristic measurement
Image Development of test methods and test rigs for stationary integrated refrigeration units
Image Cold meter

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Calibration of Low Temperature Sensors

Industry and R&D

Dr. rer. nat. Matthias Schneider

+49-351-4081-5126

According to the comparative measurement method

Accurate and reliable measurements are the requirements for high-quality research and development or industrial production. Using the comparative measurement method the following sensors can be calibrated:

  • Resistance Temperature Detectors (RTD) with positive temperature coefficient (like Platinum or Rhodium-Iron RTDs)
  • RTD with negative temperature coefficient (like Germanium or Cernox™ RTDs)
  • Diode and thermocouples.

With an automatic measuring station several temperatures according to a sample point table will be adjusted. The calibration is carried out with secondary thermometers that are calibrated by an authority. Furthermore a fix point check with LHe or LN2 will be performed. In addition, a calbriated Cernox sensor is available for measurements in the low temperature range. The measuring facility allows the calibration of about 30 sensors at once. There are continuous extensions for different sensor types.

Parameter

IndicatorMinimalMaximal
Measuring range1.5 K350 K
Measuring accuracy5 mK (1.5 ... 4.2 K)50 mK (80 ... 350 K)
Sample dimensioncommon sensor packages
Sample preparationnot necessary

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Further Projects - Research and Development

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Innovative small helium liquefier

Liquefaction rates from 10 to 15 l/h

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Filter Tests

INDUSTRIAL AND LABORATORY PRECIPITATORS

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Low Temperature Tribology

Tribological studies at cryogenic temperatures

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Refrigerants, lubricants and mixtures

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Reduction of primary noise sources of fans

...using numerical and experimental methods with contra-rotating axial fan